Gallatin River

A Montana district court ruled in favor of an environmental group that challenged the state's approval of new septic systems in the Gallatin Valley. The group argued that the state failed to assess cumulative impacts from the septic systems and how they may harm the river.

In 2023, the DEQ listed sections of the Gallatin River as impaired due to recurring algal blooms. The blooms choke out fish and degrade water quality. State scientists are amid a six-year study trying to understand what's causing the harmful blooms. The state says it will use the results to inform local development regulations and a plan to protect the river.

A new lawsuit claims the Montana Department of Environmental Quality failed to assess how nutrient pollution from septic systems near the town of Big Sky will harm the Gallatin River.

The first rivers in Montana have been closed to fishing due to hot dry weather.

Montana environmental officials are proposing to give part of the Gallatin River a pollution designation as they research the factors for excessive algae growth.

Environmental groups allege a southwestern Montana water district is illegally polluting the West Fork of the Gallatin River. On Wednesday, the groups...

The Montana Department of Environmental Quality announced Thursday that the Lower Gallatin Watershed is its next priority basin. This means hundreds of...

Flood waters remain a concern across Montana today and into next week.Flooding and flood warnings remain in effect for Missoula, where the Clark Fork is…

BOZEMAN, Mont. (AP) — A parasite that caused a major die-off of mountain whitefish in the Yellowstone River has been found in seven other rivers in…

State officials today released the third and final water quality report for the March 3 wastewater spill that polluted parts of the Gallatin…